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Tapping

Point: 200

Category

Cryptography

Question

Theres tapping coming in from the wires. What's it saying nc jupiter.challenges.picoctf.org 48247.

Hint

What kind of encoding uses dashes and dots?

Solution

First a netcat command given in the challenge description is ran in the terminal.

% nc jupiter.challenges.picoctf.org 48247
.--. .. -.-. --- -.-. - ..-. { -- ----- .-. ... ...-- -.-. ----- -.. ...-- .---- ... ..-. ..- -. .---- ..--- -.... .---- ....- ...-- ---.. .---- ---.. .---- }

A morse code is returned from the server. A python library called morse-talk is used to convert the dots and dashes to convert the encrypted message. The steps done are as below.

Install morse-talk using below command.

% pip install morse-talk

The following python code is used to programmatically convert the morse code into plain text.

import morse_talk as mdecode
code = ".--. .. -.-. --- -.-. - ..-. { -- ----- .-. ... ...-- -.-. ----- -.. ...-- .---- ... ..-. ..- -. .---- ..--- -.... .---- ....- ...-- ---.. .---- ---.. .---- }"

## Special character braces are taken out from the morse code as the decoder doesn't handle the braces.
code=code.replace('{','')
code=code.replace('}','')

mdecode.decode(code)

'PICOCTFSOLUTIONHERE'

Improvement

none